I've never used gumpaste powder - I've always mixed the gumpaste after it's been made with the fondant to harden it. If you have the powder - make some and mix it. The other option is Tylose powder - that you can definately mix into the fondant to make it harden more.
Tylose is hard to find if you don't have a cake decorating store nearby. Fortunately I do, and that's where I bought mine. Otherwise, you might need to get it online. It's fairly cheap although on some sites shipping will kill you. Cakeart.us usually has good shipping prices (at least on tiny orders of luster dust; you can buy 2 jars of dust and pay less than $3 in shipping), but I noticed she is out of tylose right now
- might want to email her to find out when it will be in stock again.
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